(19)
(11) EP 1 595 934 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.01.2010 Bulletin 2010/01

(43) Date of publication A2:
16.11.2005 Bulletin 2005/46

(21) Application number: 05009524.9

(22) Date of filing: 29.04.2005
(51) International Patent Classification (IPC): 
C09K 11/59(2006.01)
 H05B 33/14(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR LV MK YU

(30) Priority: 14.05.2004 JP 2004145718

(71) Applicant: DOWA Electronics Materials Co., Ltd.
Chiyoda-ku Tokyo 101-0021 (JP)

(72) Inventors:
  • Gotoh, Masahiro
    Chiyoda-ku Tokyo 100-8282 (JP)
  • Nagatomi, Akira
    Chiyoda-ku Tokyo 100-8282 (JP)
  • Sakane, Kenji
    Chiyoda-ku Tokyo 100-8282 (JP)
  • Yamashita, Shuji
    Chiyoda-ku Tokyo 100-8282 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Leopoldstrasse 4
80802 München
80802 München (DE)

   


(54) Phosphor and production method of the same and light source and led using the phosphor


(57) A phosphor with high efficiency having an excitation band corresponding to light of the ultraviolet-visible (300 to 550 nm) wavelength region emitted from a light emitting element which emits blue or ultraviolet light is provided. Commercially available CaO [3N], Si3N4 [3N], and Eu2O3 [3N] are prepared, respective materials are weighed and mixed to have a mol ratio of CaO: Si3N4: Eu2O3 = 1.4775: 1: 0.01125, and then the mixture is heated to 1600°C by a heating rate of 15°C/min under a nitrogen atmosphere and retained and fired at 1600°C for three hours. Thereafter, the raw materials are cooled down from 1600°C to 200°C for an hour to thereby produce a phosphor having a composition formula Ca1.58Si3O1.63N4.35: Eu0.024.







Search report